To answer your question - it is my understanding that a "red flag" gap in scores is usually 2 or more standard deviations (30-32 points). That said, no one can diagnose your child over the internet. Your child's tester has seen your child in person. On the other hand not everyone has a high level of interest or expertise in giftedness and also learning disability.
aeh is the test expert and the gifted community on this forum is grateful for aeh's insights.
Until aeh responds, you might find this information on
General Ability Index (GAI) of interest.
